Methods, systems, and devices for wireless communications are described for receiver-based listen-before-talk (LBT) in systems that use shared radio frequency spectrum. A scheduling device may provide a pre-grant indication of a data transmission. The data transmission may be transmitted via a shared millimeter wave (mmW) radio frequency spectrum band, and a LBT procedure may be performed at a receiving device responsive to the pre-grant indication, to determine that the shared mmW radio frequency spectrum band is available for the data transmission. An indication may be transmitted to a transmitting device to indicate that the receiving device has successfully performed the LBT procedure, which may act as a trigger for the transmitting device to start the data transmission.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for wireless communication, comprising: receiving, at a receiving device, a pre-grant indication of a data transmission from a scheduling device, wherein the data transmission is via a shared millimeter wave (mmW) radio frequency spectrum band; performing, responsive to receiving the pre-grant indication, a listen-before-talk (LBT) procedure to determine that the shared mmW radio frequency spectrum band is available for the data transmission, wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; transmitting, based at least in part on the shared mmW radio frequency spectrum band being available for the data transmission, a control signal from the receiving device to a transmitting device to trigger a start of the data transmission; and receiving the data transmission triggered by the control signal.
2. The method of claim 1 , wherein the pre-grant indication of the data transmission includes an LBT length parameter, and wherein a duration of the LBT procedure is based at least in part on the LBT length parameter.
3. The method of claim 2 , wherein the CCA observation time is based in part on a random number that is selected for a number of CCA slots to measure channel energy, and wherein the LBT length parameter comprises the random number.
4. The method of claim 1 , wherein the data transmission is a downlink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the transmitting device are a base station, and the receiving device is a user equipment (UE).
5. The method of claim 1 , wherein the data transmission is an uplink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the receiving device are a base station and the transmitting device is a UE.
6. The method of claim 1 , wherein the data transmission includes a downlink data portion and an uplink data portion within a transmission opportunity (TxOP), wherein the scheduling device is a base station, and wherein the base station is the transmitting device for the downlink portion and the receiving device for the uplink portion, and a UE is the receiving device for the downlink portion and the transmitting device for the uplink portion.
7. The method of claim 1 , wherein the control signal comprises a trigger indicator that the shared mmW radio frequency spectrum band is available for the data transmission and padding that provides time for the transmitting device to process the trigger indicator and initiate the data transmission within a time threshold after the control signal.
8. The method of claim 1 , wherein the pre-grant indication is a short control signaling transmission that is exempt from the LBT procedure.
9. The method of claim 1 , wherein the LBT procedure is performed based on a beamformed receiving beam that is to be used for receiving the data transmission.
10. The method of claim 1 , further comprising: transmitting from the receiving device, before performing the LBT procedure, an acknowledgment of the pre-grant indication.
11. The method of claim 10 , wherein the acknowledgment of the pre-grant indication is transmitted based at least in part on the reception of the pre-grant indication and an interference level associated with the pre-grant indication being below a threshold value.
12. The method of claim 10 , wherein the acknowledgment of the pre-grant indication is short control signaling that is exempt from CCA.
13. The method of claim 1 , further comprising: measuring an interference level during the LBT procedure; and transmitting an indication of the interference level with the control signal for setting of a modulation and coding scheme (MCS) of the data transmission.
14. The method of claim 1 , wherein the pre-grant indication further indicates a second data transmission from the receiving device to the transmitting device, and wherein the receiving device prepares the second data transmission responsive to the pre-grant indication, and wherein the method further comprises: transmitting the second data transmission responsive to a second trigger received from the transmitting device.
15. The method of claim 1 , wherein the data transmission is a first data transmission, and wherein the pre-grant indication further indicates a second data transmission from the receiving device to the transmitting device to be transmitted after the first data transmission; and wherein the method further comprises: receiving a second trigger from the transmitting device in the data transmission; and transmitting the second data transmission responsive to the second trigger.
16. A method for wireless communication, comprising: receiving, from a scheduling device, an indication of wireless resources for a data transmission between a transmitting device and a receiving device via a shared millimeter wave (mmW) radio frequency spectrum band, and a pre-grant indication of the data transmission, and wherein the receiving device is to perform a listen-before-talk (LBT) procedure prior to the data transmission, and wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; monitoring for a control signal from the receiving device that indicates the shared mmW radio frequency spectrum band is available for the data transmission; and transmitting, responsive to receiving the control signal, the data transmission via the shared mmW radio frequency spectrum band.
17. The method of claim 16 , wherein the pre-grant indication of the data transmission includes an LBT length parameter, and wherein a duration of the LBT procedure is based at least in part on the LBT length parameter.
18. The method of claim 17 , wherein the CCA observation time is based in part on a random number that is selected for a number of CCA slots to measure channel energy, and wherein the LBT length parameter comprises the random number.
19. The method of claim 16 , wherein the data transmission is a downlink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the transmitting device are components of a base station, and the receiving device is a user equipment (UE).
20. The method of claim 16 , wherein the data transmission is an uplink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the receiving device are components of a base station and the transmitting device is a UE.
21. The method of claim 16 , wherein the data transmission includes a downlink data portion and an uplink data portion within a transmission opportunity (TxOP), wherein the scheduling device is a component of a base station, and wherein the base station is the transmitting device for the downlink portion and the receiving device for the uplink portion, and a UE is the receiving device for the downlink portion and the transmitting device for the uplink portion.
22. The method of claim 16 , wherein the control signal comprises a trigger indicator that the shared mmW radio frequency spectrum band is available for the data transmission and padding that provides time for the transmitting device to process the trigger indicator and initiate the data transmission within a time threshold after the control signal.
23. The method of claim 16 , wherein the pre-grant indication is a short control signaling transmission that is exempt from the LBT procedure.
24. The method of claim 16 , further comprising: receiving, before the monitoring for the control signal, an acknowledgment that the pre-grant indication was received at the receiving device.
25. The method of claim 24 , wherein the acknowledgment of the pre-grant indication is transmitted based at least in part on an interference level measured during the LBT procedure.
26. The method of claim 24 , wherein the acknowledgment of the pre-grant indication is short control signaling that is exempt from the LBT procedure.
27. The method of claim 16 , further comprising: determining an interference measurement during the LBT procedure; and selecting a modulation and coding scheme (MCS) of the data transmission based at least in part on the interference measurement.
28. The method of claim 16 , wherein the pre-grant indication further indicates a second data transmission from the receiving device to the transmitting device, and wherein the method further comprises: performing an LBT procedure to determine that the shared mmW radio frequency spectrum band is available for the second data transmission; transmitting a trigger to the receiving device to initiate transmission of the second data transmission; and receiving the second data transmission.
29. An apparatus for wireless communication, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive, at a receiving device, a pre-grant indication of a data transmission from a scheduling device, wherein the data transmission is via a shared millimeter wave (mmW) radio frequency spectrum band; perform, responsive to receiving the pre-grant indication, a listen-before-talk (LBT) procedure to determine that the shared mmW radio frequency spectrum band is available for the data transmission, wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; transmit, based at least in part on the shared mmW radio frequency spectrum band being available for the data transmission, a control signal from the receiving device to a transmitting device to trigger a start of the data transmission; and receive the data transmission triggered by the control signal.
30. The apparatus of claim 29 , wherein the pre-grant indication of the data transmission includes an LBT length parameter, and wherein a duration of the LBT procedure is based at least in part on the LBT length parameter.
31. The apparatus of claim 30 , wherein the CCA observation time is based in part on a random number that is selected for a number of CCA slots to measure channel energy, and wherein the LBT length parameter comprises the random number.
32. The apparatus of claim 29 , wherein the data transmission is a downlink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the transmitting device are a base station, and the receiving device is a user equipment (UE).
33. The apparatus of claim 29 , wherein the data transmission is an uplink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the receiving device are a base station and the transmitting device is a UE.
34. The apparatus of claim 29 , wherein the data transmission includes a downlink data portion and an uplink data portion within a transmission opportunity (TxOP), wherein the scheduling device is a base station, and wherein the base station is the transmitting device for the downlink portion and the receiving device for the uplink portion, and a UE is the receiving device for the downlink portion and the transmitting device for the uplink portion.
35. The apparatus of claim 29 , wherein the control signal comprises a trigger indicator that the shared mmW radio frequency spectrum band is available for the data transmission and padding that provides time for the transmitting device to process the trigger indicator and initiate the data transmission within a time threshold after the control signal.
36. The apparatus of claim 29 , wherein the pre-grant indication is a short control signaling transmission that is exempt from the LBT procedure.
37. The apparatus of claim 29 , wherein the LBT procedure is performed based on a beamformed receiving beam that is to be used for receiving the data transmission.
38. The apparatus of claim 29 , wherein the instructions are further executable by the processor to cause the apparatus to: transmit from the receiving device, before performing the LBT procedure, an acknowledgment of the pre-grant indication.
39. The apparatus of claim 38 , wherein the acknowledgment of the pre-grant indication is transmitted based at least in part on the reception of the pre-grant indication and an interference level associated with the pre-grant indication being below a threshold value.
40. The apparatus of claim 38 , wherein the acknowledgment of the pre-grant indication is short control signaling that is exempt from CCA.
41. The apparatus of claim 29 , wherein the instructions are further executable by the processor to cause the apparatus to: measure an interference level during the LBT procedure; and transmit an indication of the interference level with the control signal for setting of a modulation and coding scheme (MCS) of the data transmission.
42. The apparatus of claim 29 , wherein the pre-grant indication further indicates a second data transmission from the receiving device to the transmitting device, and wherein the instructions are further executable by the processor to cause the apparatus to: transmit the second data transmission responsive to a second trigger received from the transmitting device.
43. The apparatus of claim 29 , wherein the data transmission is a first data transmission, and wherein the instructions are further executable by the processor to cause the apparatus to: receive a second trigger from the transmitting device in the data transmission; and transmit a second data transmission responsive to the second trigger.
44. An apparatus for wireless communication, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive, from a scheduling device, an indication of wireless resources for a data transmission between a transmitting device and a receiving device via a shared millimeter wave (mmW) radio frequency spectrum band, and a pre-grant indication of the data transmission, and wherein the receiving device is to perform a listen-before-talk (LBT) procedure prior to the data transmission, and wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; monitor for a control signal from the receiving device that indicates the shared mmW radio frequency spectrum band is available for the data transmission; and transmit, responsive to receiving the control signal, the data transmission via the shared millimeter wave (mmW) radio frequency spectrum band.
45. The apparatus of claim 44 , wherein the pre-grant indication of the data transmission includes an LBT length parameter, and wherein a duration of the LBT procedure is based at least in part on the LBT length parameter.
46. The apparatus of claim 45 , wherein the CCA observation time is based in part on a random number that is selected for a number of CCA slots to measure channel energy, and wherein the LBT length parameter comprises the random number.
47. The apparatus of claim 44 , wherein the data transmission is a downlink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the transmitting device are components of a base station, and the receiving device is a user equipment (UE).
48. The apparatus of claim 44 , wherein the data transmission is an uplink-centric data transmission within a transmission opportunity (TxOP), and wherein the scheduling device and the receiving device are components of a base station and the transmitting device is a UE.
49. The apparatus of claim 44 , wherein the data transmission includes a downlink data portion and an uplink data portion within a transmission opportunity (TxOP), wherein the scheduling device is a component of a base station, and wherein the base station is the transmitting device for the downlink portion and the receiving device for the uplink portion, and a UE is the receiving device for the downlink portion and the transmitting device for the uplink portion.
50. The apparatus of claim 44 , wherein the control signal comprises a trigger indicator that the shared mmW radio frequency spectrum band is available for the data transmission and padding that provides time for the transmitting device to process the trigger indicator and initiate the data transmission within a time threshold after the control signal.
51. The apparatus of claim 44 , wherein the pre-grant indication is a short control signaling transmission that is exempt from the LBT procedure.
52. The apparatus of claim 44 , wherein the instructions are further executable by the processor to cause the apparatus to: receive, before the monitoring for the control signal, an acknowledgment that the pre-grant indication was received at the receiving device.
53. The apparatus of claim 52 , wherein the acknowledgment of the pre-grant indication is transmitted based at least in part on an interference level measured during the LBT procedure.
54. The apparatus of claim 52 , wherein the acknowledgment of the pre-grant indication is short control signaling that is exempt from the LBT procedure.
55. The apparatus of claim 44 , wherein the instructions are further executable by the processor to cause the apparatus to: determine an interference during the LBT procedure; and select a modulation and coding scheme (MCS) of the data transmission based at least in part on the interference measurement.
56. The apparatus of claim 44 , wherein the pre-grant indication further indicates a second data transmission from the receiving device to the transmitting device, and wherein the instructions are further executable by the processor to cause the apparatus to: perform an LBT procedure to determine that the shared mmW radio frequency spectrum band is available for the second data transmission; transmit a trigger to the receiving device to initiate transmission of the second data transmission; and receive the second data transmission.
57. An apparatus for wireless communication, comprising: means for receiving, at a receiving device, a pre-grant indication of a data transmission from a scheduling device, wherein the data transmission is via a shared millimeter wave (mmW) radio frequency spectrum band; means for performing, responsive to receiving the pre-grant indication, a listen-before-talk (LBT) procedure to determine that the shared mmW radio frequency spectrum band is available for the data transmission, wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; means for transmitting, based at least in part on the shared mmW radio frequency spectrum band being available for the data transmission, a control signal from the receiving device to a transmitting device to trigger a start of the data transmission; and means for receiving the data transmission triggered by the control signal.
58. An apparatus for wireless communication, comprising: means for receiving, from a scheduling device, an indication of wireless resources for a data transmission between a transmitting device and a receiving device via a shared millimeter wave (mmW) radio frequency spectrum band, and a pre-grant indication of the data transmission, and wherein the receiving device is to perform a listen-before-talk (LBT) procedure prior to the data transmission, and wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; means for monitoring for a control signal from the receiving device that indicates the shared mmW radio frequency spectrum band is available for the data transmission; and means for transmitting, responsive to receiving the control signal, the data transmission via the shared mmW radio frequency spectrum band.
59. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: receive, at a receiving device, a pre-grant indication of a data transmission from a scheduling device, wherein the data transmission is via a shared millimeter wave (mmW) radio frequency spectrum band; perform, responsive to receiving the pre-grant indication, a listen-before-talk (LBT) procedure to determine that the shared mmW radio frequency spectrum band is available for the data transmission, wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; transmit, based at least in part on the shared mmW radio frequency spectrum band being available for the data transmission, a control signal from the receiving device to a transmitting device to trigger a start of the data transmission; and receive the data transmission triggered by the control signal.
60. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: receive, from a scheduling device, an indication of wireless resources for a data transmission between a transmitting device and a receiving device via a shared millimeter wave (mmW) radio frequency spectrum band, and a pre-grant indication of the data transmission, and wherein the receiving device is to perform a listen-before-talk (LBT) procedure prior to the data transmission, and wherein the LBT procedure is a clear channel assessment (CCA) check using energy detection (ED) for a duration of a CCA observation time; monitor for a control signal from the receiving device that indicates the shared mmW radio frequency spectrum band is available for the data transmission; and transmit, responsive to receiving the control signal, the data transmission via the shared mmW radio frequency spectrum band.
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April 1, 2019
November 17, 2020
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